The walls, floor, and ceiling are covered with blue tiles. A staircase leads up to the first floor. A projector can be found to the left. To the right, after climbing a ladder, a small passage can be entered. It eventually ends in a rock cave-in.

In Submachine Universe the doorway to the stairs is bricked up and the way down to the Lighthouse dungeon is sealed off with tiles. That room now contains a portal.